I could interlock you could interlock he could interlock we could interlock you could interlock they could interlock
V-ing form
I could be interlocking you could be interlocking he could be interlocking we could be interlocking you could be interlocking they could be interlocking
Perfect
I could have interlocked you could have interlocked he could have interlocked we could have interlocked you could have interlocked they could have interlocked
V-ing perfect
I could have been interlocking you could have been interlocking he could have been interlocking we could have been interlocking you could have been interlocking they could have been interlocking
Negation
Simple form
I couldn't interlock you couldn't interlock he couldn't interlock we couldn't interlock you couldn't interlock they couldn't interlock
V-ing form
I couldn't be interlocking you couldn't be interlocking he couldn't be interlocking we couldn't be interlocking you couldn't be interlocking they couldn't be interlocking
Perfect
I couldn't have interlocked you couldn't have interlocked he couldn't have interlocked we couldn't have interlocked you couldn't have interlocked they couldn't have interlocked
V-ing perfect
I couldn't have been interlocking you couldn't have been interlocking he couldn't have been interlocking we couldn't have been interlocking you couldn't have been interlocking they couldn't have been interlocking
Interrogative form
Simple form
could I interlock? could you interlock? could he interlock? could we interlock? could you interlock? could they interlock?
V-ing form
could I be interlocking? could you be interlocking? could he be interlocking? could we be interlocking? could you be interlocking? could they be interlocking?
Perfect
could I have interlocked? could you have interlocked? could he have interlocked? could we have interlocked? could you have interlocked? could they have interlocked?
V-ing perfect
could I have been interlocking? could you have been interlocking? could he have been interlocking? could we have been interlocking? could you have been interlocking? could they have been interlocking?
Interro-negative form
Simple form
couldn't I interlock? couldn't you interlock? couldn't he interlock? couldn't we interlock? couldn't you interlock? couldn't they interlock?
V-ing form
couldn't I be interlocking? couldn't you be interlocking? couldn't he be interlocking? couldn't we be interlocking? couldn't you be interlocking? couldn't they be interlocking?
Perfect
couldn't I have interlocked? couldn't you have interlocked? couldn't he have interlocked? couldn't we have interlocked? couldn't you have interlocked? couldn't they have interlocked?
V-ing perfect
couldn't I have been interlocking? couldn't you have been interlocking? couldn't he have been interlocking? couldn't we have been interlocking? couldn't you have been interlocking? couldn't they have been interlocking?